Help! I think my friend is going through an emotional break down and I dont know what to do?

So usually my friend is pretty strong willed and can hold herself together. Im her best friend but she usually is really independent and never tells anyone her feelings and refuses to see a therapist. But then bad things started happening like her dad which she only sees on weekends disowned her, then her other best friend betrayed her and another best friend of hers which dated her other best friend died. She promised him she would always protect her before he died. I noticed after that she was a little off and was more independent then ever. Then she got into an arguement with her mom and now she plans on kicking her out of the house. I asked her if she wanted to stay at my place but she refused and said she would be fine on her own and didnt want to be a burden. A little while after that she randomly invited me to go over her house. Out of nowhere she just started shaking and started to cry. She said she wants to die because she blames herself for his death but she knows she cant because she promised to protect her former best friend. She started to say she didn't care about life anymore and that she didn't need her family. She said if she has to shell kill everyone to keep her safe and doesnt care if she becomes a monster. She said she was scared and then she ran off and I havent seen her since. I dont know what I should do, does anyone have any ideas?